IntroductionSweet potato is a crop with rich nutritional values includingcarbohydrates, dietary fibers, vitamins, and minerals [1]. Cur-rently, it is the sixth most popular and abundant staple foodworldwide. It plays an important role in solving the issues offood, energy, natural resources and environment. Four com-monly available colored sweet potato species in China are white,yellow, orange, and purple, which have completely differentchemical compositions.